Stackable cube



FIG. 1 is a perspective view of a stackable cube showing my new design;

FIG. 2 is a top view thereof, the bottom view being identical to the top view;

FIG. 3 is a right side view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a front view thereof, the back view being identical to the front view;

FIG. 6 is a front view the stackable cube as in FIG. 1, the arrangement of the four vertically stacked cubes is shown in broken lines; and,

FIG. 7 is a front view showing the stackable cube as in FIG. 1, the four by four matrix of the stackable cube is shown in broken lines.

The portions of the drawings appearing in broken line are for illustrative purposes only and do not form part of the design. 

I claim the ornamental design for a stackable cube, as shown and described. 